Introductory Physics Homework Help Forum

Post thread
Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
Why Is Average Thermal Power Not Negative in This Friction Scenario?
  • · Replies 1 ·
Replies
1
Views
1K
Equilibrium Question Involving boat and scale
  • · Replies 3 ·
Replies
3
Views
3K
Mirror system in geometrical optics
  • · Replies 9 ·
Replies
9
Views
2K
MIT OCW 8.01 PS11.3: Elastic Collision Between Ball and Pivoted Rod
  • · Replies 10 ·
Replies
10
Views
2K
Towing two stacked boxes up a ramp
  • · Replies 4 ·
Replies
4
Views
1K
Log-log graph of resistance against temperature for a carbon resistor
  • · Replies 12 ·
Replies
12
Views
1K
Questions about a spring-mass system hanging vertically
  • · Replies 7 ·
Replies
7
Views
2K
Attempting to teach this: Momentum and Impulse
  • · Replies 10 ·
Replies
10
Views
2K
Chrenkov radiation cone angle vs. the speed of the particle
  • · Replies 17 ·
Replies
17
Views
3K
Calculate ideal-gas temperature of a material
  • · Replies 2 ·
Replies
2
Views
2K
Questions Regarding a Cat Going Up a Ramp
  • · Replies 56 ·
2
Replies
56
Views
4K
Oscillator Differentials: What's a physical meaning of complex part of the solution for coordinate change of the anharmonic oscillator?
  • · Replies 5 ·
Replies
5
Views
895
Describe how you could use a pith ball as an electroscope
  • · Replies 3 ·
Replies
3
Views
1K
IGCSE Pressure Question: How many balloons can be inflated?
  • · Replies 8 ·
Replies
8
Views
3K
Method of mirroring - metal plates
  • · Replies 11 ·
Replies
11
Views
2K
Nuclear Fission Energy and Mass Loss
  • · Replies 4 ·
Replies
4
Views
1K
How to Analyze the FBD of a Toy Car on the Underside of a Dome?
  • · Replies 2 ·
Replies
2
Views
799
Calculate magnetic dipole of other planets relative to the Earth
  • · Replies 4 ·
Replies
4
Views
1K
Projectile Motion Problem: Kicking a soccer ball over a fence
  • · Replies 11 ·
Replies
11
Views
2K
Holonomic constraints and non-holonomic system
  • · Replies 2 ·
Replies
2
Views
693
Modelling a spring system with damping force and external forces
  • · Replies 1 ·
Replies
1
Views
798
Physics problem - Salmon jumping waterfall
  • · Replies 5 ·
Replies
5
Views
2K
Need help with a question on potential difference
  • · Replies 7 ·
Replies
7
Views
1K
A Level: Rearranging Equations into Y = mx + c
  • · Replies 14 ·
Replies
14
Views
2K
What Are the Key Equations in Shock Wave Analysis?
  • · Replies 5 ·
Replies
5
Views
884
Two masses and two pulleys problem
  • · Replies 33 ·
2
Replies
33
Views
10K
Object A (in free fall) hits object B (ascending with constant velocity)
  • · Replies 33 ·
2
Replies
33
Views
2K
Help with question on motion: Avoiding a rear-end collision
  • · Replies 6 ·
Replies
6
Views
3K
Can a sudden blow truly change potential energy?
  • · Replies 4 ·
Replies
4
Views
1K
Spring-mediated dipole in a magnetic field
  • · Replies 31 ·
2
Replies
31
Views
2K
Falling hailstones hitting two car windscreens
  • · Replies 23 ·
Replies
23
Views
1K
Pulling a block along a surface using a string inclined at an angle
  • · Replies 3 ·
Replies
3
Views
1K
Is my work correct? (Two students running on a track)
  • · Replies 16 ·
Replies
16
Views
1K
Particle dynamics (mechanics): inclined plane, pulley, two blocks
  • · Replies 14 ·
Replies
14
Views
2K
Newton's law problem: Pushing 2 stacked blocks on a horizontal table
  • · Replies 13 ·
Replies
13
Views
3K
Very heavy particle collides with a very light particle
  • · Replies 11 ·
Replies
11
Views
5K
Finding the position where the electric field is zero
  • · Replies 2 ·
Replies
2
Views
2K
Find the partial diameter error of the surface area of cylinder
  • · Replies 3 ·
Replies
3
Views
932
Charge density in sphere that makes constant radial E-field inside
  • · Replies 14 ·
Replies
14
Views
2K
Kinematic car overtake problem: Don’t know what to do...
  • · Replies 22 ·
Replies
22
Views
3K
Force exerted on block B by Block A when being pushed on a frictionless surface
  • · Replies 3 ·
Replies
3
Views
1K
Question(s) Regarding Magnitude of Force (Window Washer Problem)
  • · Replies 3 ·
Replies
3
Views
1K
Change in volume of sphere with change in temperature
  • · Replies 19 ·
Replies
19
Views
2K
Q： Why is it a reversible adiabatic process but not isentropic?
  • · Replies 9 ·
Replies
9
Views
1K
Is the Photoelectric Effect Proof That Light Is a Particle?
  • · Replies 35 ·
2
Replies
35
Views
3K
Tension in cable D is equivalent to the tension in cable B?
  • · Replies 8 ·
Replies
8
Views
2K
Sequences of measurements in quantum mechanics
  • · Replies 9 ·
Replies
9
Views
1K
Is the normal force at the top of a rollercoaster loop always directed upwards?
  • · Replies 5 ·
Replies
5
Views
3K
Foucault Pendulum at the North Pole
  • · Replies 9 ·
Replies
9
Views
2K
What is the Largest Quantum Number for Li3+ with a 60 Å Orbital Radius?
  • · Replies 2 ·
Replies
2
Views
967
Why is momentum equal to mass times velocity?
  • · Replies 7 ·
Replies
7
Views
2K
Potential at a point inside a solid non conducting uniformly charged sphere
  • · Replies 4 ·
Replies
4
Views
2K
Why is there are precession frequency here?
  • · Replies 1 ·
Replies
1
Views
906
How Does Centripetal Force Influence the Flight of a Rubber Band?
  • · Replies 6 ·
Replies
6
Views
2K
Calculating relative velocity -- Jumping between two moving trains
  • · Replies 3 ·
Replies
3
Views
809
Ohm's Law confusion -- How to handle an incandescent bulb?
  • · Replies 7 ·
Replies
7
Views
2K
Calculating Torque on this Square
  • · Replies 20 ·
Replies
20
Views
3K
The velocity of a satellite rotating around the Earth
  • · Replies 3 ·
Replies
3
Views
812
Doubt Calculating the Total Displacement for this Person Walking
  • · Replies 6 ·
Replies
6
Views
1K
Brightness of two lamps in a circuit having a changing magnetic field
  • · Replies 10 ·
Replies
10
Views
1K
Which material has the greatest Young's Modulus?
  • · Replies 2 ·
Replies
2
Views
2K
How many discs will slide off the board as it decelerates?
  • · Replies 17 ·
Replies
17
Views
1K
Correct energy transformation about circuit with EMF, a resistor and a motor
  • · Replies 11 ·
Replies
11
Views
1K
Momentum in a Head-on collision
  • · Replies 2 ·
Replies
2
Views
996
Contradictory Sources: Trying to understand waves on a rope being reflected at a boundary
  • · Replies 22 ·
Replies
22
Views
2K
Assistance in cutting down unneeded information in physics report
  • · Replies 7 ·
Replies
7
Views
932
2 masses connected by spring, one is pulled, how much does the spring stretch?
  • · Replies 3 ·
Replies
3
Views
1K
Questions about speed and motion of a toy car on a conveyor belt
  • · Replies 11 ·
Replies
11
Views
2K
Diffrence between resolving vector to components and find projections
  • · Replies 4 ·
Replies
4
Views
1K
Two Equations for Average Velocity?
  • · Replies 2 ·
Replies
2
Views
2K
Will The Cars Stop In Time? - Check My Work Please :)
  • · Replies 13 ·
Replies
13
Views
2K
How can a transistor behave as a switch in the saturated region?
  • · Replies 5 ·
Replies
5
Views
1K
Electric field in a second dielectric given a 2 dielectric system
  • · Replies 2 ·
Replies
2
Views
1K
Atwood at an incline accelerating down
  • · Replies 2 ·
Replies
2
Views
933
Coherent interference at a low photon flux rate
  • · Replies 3 ·
Replies
3
Views
875
Work done during a collision -- Change in Kinetic Energy & change in Momentum
  • · Replies 1 ·
Replies
1
Views
2K
What is the rocket's initial acceleration?
  • · Replies 6 ·
Replies
6
Views
1K
Working mechanism of straws and siphon
  • · Replies 1 ·
Replies
1
Views
777
Magnetic field in a solenoid with rectangular cross-sectional area
  • · Replies 25 ·
Replies
25
Views
3K
Calculations involving different Dielectrics and Capacitors
  • · Replies 7 ·
Replies
7
Views
2K
Why Does Torque Equilibrium Not Solve for Fcy in Static Equilibrium Problems?
  • · Replies 9 ·
Replies
9
Views
4K
Special Relativity problem: Lorentz transformation and Reference Frames
  • · Replies 6 ·
Replies
6
Views
2K
Why can a fluid that satisfies the continuity equation cross streamlines?
  • · Replies 14 ·
Replies
14
Views
1K
E&M: Gauss' Law Surface Charge Density
  • · Replies 4 ·
Replies
4
Views
1K
What force is needed to break a rope?
  • · Replies 8 ·
Replies
8
Views
2K
Particle experiencing only an angular force, determine the r dot
  • · Replies 15 ·
Replies
15
Views
2K
A circuit involving two non-linear resistances (incandescent lamps)
  • · Replies 14 ·
Replies
14
Views
2K
Q: Confusing Conservation of Mass Flow Rate and Conservation of Flow Rate
  • · Replies 19 ·
Replies
19
Views
2K
Why Was My Thread Closed on the Physics Forum?
  • · Replies 22 ·
Replies
22
Views
1K
Is My Approach to Calculating Relative Velocity Correct?
  • · Replies 20 ·
Replies
20
Views
2K
Difficulty in deciding when to apply work energy theorem
  • · Replies 2 ·
Replies
2
Views
1K
Rydberg constant for hydrogen atom and Balmer series
  • · Replies 2 ·
Replies
2
Views
1K
Work done by gravity on a car rolling down a hill
  • · Replies 4 ·
Replies
4
Views
1K
Basketball thrown straight up from the ground
  • · Replies 1 ·
Replies
1
Views
720
Q: The instantaneous gas discharge of the system and the C-E
  • · Replies 9 ·
Replies
9
Views
882
Problem with when to use Force and Energy. What compresses spring/
  • · Replies 3 ·
Replies
3
Views
1K
Question about Formulae for Motion in a Rotating Reference Frame
  • · Replies 2 ·
Replies
2
Views
2K
Fraction of light reflected inside a diamond
  • · Replies 5 ·
Replies
5
Views
1K
Estimating Error in Wavelength from Graphical Approach
  • · Replies 11 ·
Replies
11
Views
1K
What will the final velocity of the particles be?
  • · Replies 7 ·
Replies
7
Views
872